Means for reducing shock in the escapement mechanisms of typewriters



J. F. KOCA MEANS FOR REDUCING SHOCK IN THE ESCAPEMENT MECHANISMS OF TYPEWRITERS 2 Sheets-Sheet 1 I Filed Dec. 8, 1936 I JnwsMcQ/ Nov, 29, 1938. J. F. Kw 8.324

MEANS FOR REDUCING SHOCK IN .THE ESCAPEMENT MECHANISMS OF. TYPEWRITFIRS Filed.[)ec..8, 1936 Z Sh e'ets-Sheet 2 5 Y J5 J4 23 33 19 a0 54 I: O B4 fivenlar':

J lmes 11060 g @07: f

A lotyping.

Patented Nov. 29,

, 1.158324 H g a "Mann's sort asnucmcsnobx mrnass-f cagsmr MECHAhlISMS or rrriiwar'n' me. P. Koca', Woodstock,-1ll., that a wasi i stock Typewriter Company, Woodstock, Ill., a.

. mutton f Application December-8.19816," seriaino. 114,191 (otisi-azyq This invention relates to means" for reducing shock in the escapementmechanisms'oftypewriters.

In ordinary typewriters now in use, the sudden stopping of the platen and escapement mecha-' nism controlling the spacing movements'of the platen causes considerable wear of the parts which interact to perform those functions, and thiswear causes misspacing and inaccuracy in The sudden" unyielding clash of the parts which thus interact also causes vibration in the machineand the generation of noise.

It is an object of applicant's invention to pro- 15 vide means for reducing the wear and noise attendant upon the stopping of the platen and escapement mechanism.

' It is a 'further object of applicant's invention to provide means for mounting the escapement ,26 control mechanism upon the frame of the typewriter infsuch manner as to reduce the wear and noiseattendant upon the operation of this mechanism.

' Certain commercial typewriter machines 25 mount the hanger assembly for the escapement mechanism upon a spring-urged, pivoted frame in order to reduce the wear and noise of this escapement mechanism. However, in this pivoted arrangement there will be a movement of 30 thepivoted assembly and a recoil at each operationof the escapement mechanism. An operator often strikes a letter during the recoil period and the accuracy of the spacing is therefore destroyed. It is accordingly a' further object of 35 applicant's invention to produce a mounting for the escapement mechanism which substantially eliminates any recoil of the escapement mechanism and its mounting.

The accompanying drawings illustrate a se- 40 lected embodiment of the invention and'the views therein are as follows:

Fig. 1 is a side view of a typewriter showing in.

section applicant's invention attached thereto.

Fig. 2 is a sectional elevation taken along the 45 line 2--2 of Fig. 1.

Fig. 3 is a sectiontaken along the lined-4 of Fig. 2.

Fig. 4 is a perspective view of thesupporting frame of the escapement control mechanism.

to As shown in Figs. 1 and 2, the numeral l0 designates the top frame of a typewriter chine, such as the "Woodstock typewriter. Mounted upon the frame It, in the usual manner for slidable movement transversely thereof, carriage ll. whose rearf,

55 is the platen-carrying depending edge. carries the usualrack bar l2. 'I'herack bar I2 is operated by apinion l3 which is loosely mounted upon a spindle l4 and retained against axial movement-in the usual '-manner. I An escapement wheel l5 isalso loosely 'Journaledl on thespindle it outwardly of the pinion; l3. The somewhat U-shaped frame member I6 shown in Fig. 4 is mounted upon the rear of the frame member I0 in the following manner.

- Strips l1 and I8 of resilient rubberare placed 10 above the horizontal leg of the frame member l6 and-are interposed between said'frame member I and the frame ID. A strip l9 or resilient rubber is interposedbetween the'frame member I6 and a bottom supporting plate 20. Bolts 2| pass through alined apertures in the frame In, the rubber strips ll, I8, the'frame member IS, the rubber strip l9 and the supporting plate to resiliently mount the frame member it upon the frame 10 of the typewriter. The apertures 22 of 20 v the frame member l6, through which the bolts 2| pass, are of a size greater than the shank of the bolt and receive therein rubber washers 23 which surround the shank of the bolt to prevent any vibration being set up between the bolts and the 25 frame member I6. Pointed screws 24 thread through apertures in the depending legs of the frame member l6 and support the'usual escapement control mechanism designated generally by the numeral 25. The master control lever 26 30 of the escapement control mechanism is operated by the customary space bar 30 in the usual manner through links 21, 28 and 29. The somewhat U-shaped frame member l6 carries at the central portion of its horizontal leg a bearing portion3'l for the spindle l4 and the frame member In is recessed to permit the passage of the bearing portion 2|. It is to be noted that the edges of the bearing portion 3| [do not come in contact with the sidesof the 40 recess of the frame member In through which the bearing portion passes. The spindle I4 is prevented from rotating relative to the bearing portion 3| by a screw. 32, which passes through the extended end 33 of the bearing portion 3! and frictionally clamps the spindle l4 thereto.

writer will be rendered more quiet and the "eacapement mechanism, and the parts which interact therewith to stop the carriage at the 1 proper spacing distance, will be subjected to'less I; I

wear. The accuracy of typing will be maintained thereby and for a considerably greater period.

What I claim is:

1. In a typewriter or the like, an upper frame member, a platen carriage movably mounted directly thereon, a rack bar carried by said carriage, a pinion meshing with said rack bar, an escapement wheel for controlling the movement of the pinion in one direction, a spindle upon which said pinion and escapement wheel are mounted, mechanism for controlling the spacing movement of the escapement wheel, a frame member having a bearing portion for receiving and supporting the spindle and having dependent legs upon which the escapement control mechanism is mounted and means for resiliently mounting said last mentioned frame member upon the upper frame memberof the typewriter to thereby minimize the wear and noise attendant upon the operation of the carriage by the escapement wheel and its control mechanism.

2..,In a typewriter or the like having a frame, a platen carriage movably supported directly thereon, an escapement mechanism causing the step-by-step movement of the carriage, ,a space g r bar and pivoted levers interconnecting the space bar and escapement mechanism for causing the operation thereof, means for mounting the escapement mechanism upon the frame of the typewriter, said means comprising a frame member upon which said escapement mechanism is mounted, strips of resilie'nt material interposed between said frame member andrthe framepf the typewriter and means for. securing the frame a platen carriage movably supported thereon, an I escapement mechanism controlling the step-bystep movement of the carriage, a space bar and pivoted levers interconnecting the space bar and escapementmechanism for causing the operation thereof,'means for mounting the escapement mechanism upon the frame of the typewriter,

said means comprising a frame member upon which said escapement mechanism is' mounted, a supporting plate, strips of resilient material interposed between the frame member, the frame and the supporting plate, and fastening means passing through the resilient strips and the frame member and securing the supporting plate tothe frame of the typewriter.

5. In a typewriter or the like, having a main frame and a platen.carriage carried directly -thereby, the combination of escapement mechae R-K CA. 

